Paper folding machine



March 2,1937. M Amuse, E r'AL 2,072,790

' PAPER FoL'DInfG MACHINE Filed Oct. 16, 1935 5 Sheets-Shea?l l March"2, 1937.

M. APH-zscH E1- Al.

PAPER FOLDING'MACHIINE 5 Sheets-Sheet 2 Filed Oct. 16, 1955 March 2,193? M. APlTzscH Er AL PAPER FOLDING MACHINE Filed oet. 16; 1955 5Sheets-SheetI 3 f2 from yl Mard '2, 1937- M, APrrzcH E1' AL 2,072,790

PAPER FOLDING MACHINE Filed Oct. 16. 1935 5 Sheets-Sheet 4 March 2,1937. MrAPlTzscH ET AL .PAPER FOLDING MACHINE Filed oct. 15. 1955 5sheets-sheet 5 lNvENToRs MAX APITZS C'H OSCAR "KLEINSCHMIT By M @0% UQTT'OP/VEY Patented Mar. z, 1937 UNITED STATES PAPER FOLDING MACm MaxApitxsch and Oscar Kleinachmlt, .Leipzigf Plagwitz, Germany, assignorsjoGebruder Brehmer, Leipzig-Plagwitl, Germany, a Gerfirm man Applicationoctober 1e, 1935, semi No. 45.322

In Germany January 31, 1935 e5 claims. (ci 27o-cz) 'Ihis invention.relates to improvements in machines for folding paper or like sheetsenabling the sheets in their passage through the machine to be foldedand if desired also cross folded with great accuracy without -the use ofany timed mechanism such as'the customary folding knife or like device.It is concerned more particularly with a method of folding as describedin the specification of U. S. Patent No."v 1,961,000, according to whichthe sheets to be folded are fed over a pair of inversely rotating foldrolls and are brought into contact with a guide associated with the foldrolls with its folding edge so shaped that .the sheets are progressivelypressed between the'rolls, and on being seized by the latter arefoldedthereby along the line of contact of theredge of the fold guidewith the sheet. The means particularly described and claimed in theprior patent specication for carrying the method into effect involve theuse of a stationary fold guide.

Now the object of the present invention is to carry said method intoeect by the provision of means modified to enable a moving fold guide orlike member to be employed with satisfactory results. To this endaccording to the inventiona movable guide provided to co-operate withthe fold rollsis employed to cause a sheetin its passage over thel rollsto be directed into the bite of the rolls while moving along a 'pathinclined to the longitudinal axes of the rolls.

By virtue of this arrangement the edge of the fold guide on meetingthesheet travels therewith while guiding the sheet between the foldrollswith a gradually progressive pressure, so reducing drag upon the sheetsand entirely obviating such drag if the fold guide is setto travel atthe same speed as the sheet. Moreover by -performing the foiding of thesheets in this manner, dis.- tortion of the work is avoided, with theadditional advantage over the known timed knife folding methods in thatsqueezing or secondary folds do *not occur or occur only to a muchsmaller extent,

whileat the opposite point of the li'ne of folding v the presentinvention for cross folding the sheets' fed thereto, from the precedingbuckle fold set,

' Fig. 2 isa plan view of the arrangement shown inFig. 1, partly brokenaway to avoid a confusion of the parts, ,I

' Fig. 2a is a fragmentary plan view showing the mounting oftheadjustable head-stop.

Fig. 8 is a fragmentary elevational view showing an alternativearrangement of the folding def vice of this invention;

Fig. 9 is a fragmentary elevational view showing an alternativearrangement of the cross-fold rolls, and

Fig. 10 is a plan view of the fold rolls shown in Referring moreparticularly to Fig. 1 the sheet folding machine shown in the drawingscomprises a sheet feed table A, buckle fold section B, the cross foldsection C and a delivery conveyor D. The table A is indicated as a worksupport upon which the sheets to be parallel folded are progressed tothe first fold set of the buckle fold section. B. The fold section Bdoes not form a specific part of the construction according to thepresent invention and therefore is merely diagrammatically indicatedascomprising fold rolls I0 with which are associated in well knownmanner'the buckle plates II, buckling stops I2 and vsheet defiector Il.Scoring discs Il are interposed between the delivery roll Ila of thethird buckle 'fold' set and the cross fold section C. The y discs Il arearranged transversely to score the parallel folded sheets along the lineof ,the proposed cross fold as the parallel folded sheets are fed to thecross fold section C.

Referring to Figs. 1, 2, and 3, the framework of i the machine includesside framesY I5 and transverse frame plates I6: The rolls I0 arejournalled in the side frames I5 while the buckle plates Il aresupported by suitable ybrackets -(not shown) also secured to the saidframes. Shafts I l, journalled in the frames I5, serve to carry thescoring discs I4 and also have mounted thereon pairs of rolls I8 whichco-operate to feed the parallel folded sheets to the cross foldsectionC. f

Rolls I9, journalle'd 'in the cross frame members I 6 are set betweenthe side frames I5 and at right angles to the fold rolls I0 toconstitute the folding means of the fold section C.

The rolls I9 are set-level with the roll Illa, and the sheets to becross folded are conveyed thereto bycontinuous conveyor tapes 2l. Shafts2|, Zia, 2Ib, andv 2Ic extending parallel with the shaft Il and alsojournalled inside frames I5 to either end of the rolls I9, are providedwith pulleys 2| d around which pass the. continuous conveyor tapes 20. Aroll 22, carried by a shaft 22a which may engage in guide slots in theframes |5, rests in the bights of the tapes 20 as shown in Fig. 1 totension the tapes in usual manner. The tapes 20 are driven from afriction disc 23 mounted upon a drive shaft 23a. Alternatively any orall of the shafts 2|-2Ic may be driven to eifect the drive of theconveyor'tapes. Side guides 24 are associated with the conveyor tapes 20to guide the sheets along the correct path of travel. To this end theside guides 24.comprise members of L-shaped cross section extendingparallel with the tapes 20 andsuspended from a..

cross bar' 25 -by clamps 26 so as to be laterally adjustabletransversely of the conveyor tapes. Retaining strips 24E? are associatedwith the side guides `211 to retain therein the edges of the guidedsheets. The cross bar 25 is secured at its extremities to the sideframes i5 and also has attached thereto a blade spring 21 which extendstowards the scoring discs i4 and bends downward to terminate immediatelyabove a roll 29 which is carried by the shaft 2l and aligned with Athescoring discs I4. A runner or follower disc -3|) carried in a bearingbracket secured to the free end of the bladespring 21 is set above theroll 29 to bear upon the sheets passing to the tapes "and is alignedwith the scoring discs i4 so as to enter the grooves scored inthesheets, thereby to afford additional guidance to the latterin theirpassage to the cross fold section.

As shown in Figs. 2 and 3, rods 46 are suspended from the cross bar 25by adjustable clamping brackets 41 so as to extend longitudinally of theinner conveyor tapes 20. The rods 46 are laterally adjustable along thecross bar 25 and serve to carry brackets 49. Arms 50 secured to thebrackets 49 and extending parallel with the tapes 20 have discs orvrunners 5| mounted at their free extremities to engage the sheets andpress the latter into engagement with the tapes`20. Plates 52 setbeneath the upper stretches of the inner conveyor tapes 25 and extendinglongitudinally thereof provide a bearing surface whereby the tapes aresupported in firm contact with the work conveyed thereby. The inneredges of the plates 52 closely abut beneath the left hand portions ofthe tapes-2li but are aredoutward towards the right handextremity of thetapes to provide a wedge shaped gap between said plates through whichthe sheets pass when engaged by the rolls I9.

The travelling fold guide whereby the sheets are pressed between thefold rolls I3 is constif tuted by a series -of elements such as, thebladeshaped members 3| shown in the drawings, which are constrained tomove along a closed path in a vertical plane passing through the bite ofthe fold rolls. The individual elements or blades 3| may be mounted inspaced or abutting Yrelationship upon a carrier belt or chain or, as

shown in the drawings, are freely mounted in abutting relationship inacontinuous guideway. With this object in view a rigid structurecomprising a pair of vertically disposed housing plates 32 are mountedabove the rolls I9 so :as to extend longitudinally thereof and at aninclination to the horizontal. 'I'he plates 32 have their inner, opposedfaces suitably fashioned to'form a continuous channel 33 4which isT-shaped in cross section. rIfhe tail of the T-channel comprisesthelguideway to receive` and constrain the bladesl, while the crosspiece of the T channel receives. and forms a runway for rollers 34roltatably mounted upon pins 34a. which project outwardly on eitherlside from, and at right angles to the rblades, adjacent the basesthereof (see Figs. 1, 3, 4, and 5). The fold guide blades 3| thus freelytravel along the gyuideway 33 and are shunted along by mutual contactbetween the blades, the initial. movement of which is achieved ashereinafter described. l

The plates Y32 are supported at the left hand extremity thereof (asviewed in Figs. l and 2) by bearing brackets 35 which are rigidlysecured to the cross bar 25 so as to be laterally adjustable thereon andare 'bossed at their lower extremities to provide bearings fora'transverse stub shaft 36.

The shaft 36 passes through the plates 32 to tremities of the links 39are secured by a pin 39h to a slide 4Q. grooved bracket 4|, rigidlysecured to a cross bar 42 and laterally adjustable thereon, slidablysupports the slide whilethe relative position of the members 40, '4| isdeter-V mined by a set screw 43 which passes throughfa threaded hole inthe Llug of the slide 40 to engage the bracket 4|. Thus, the right handend of the plate 32 can be raised or lowered about the axis of the shaft36 to adjust Athe depth of the downward movement of the guide blades 3|and the inclination of the path of travel thereof relatively to thelongitudinal axes of the fold rolls |9 and it will be obvious that ifdesired the left hand mounting of the housing plates 32 may similarly beadjustable. Moreover, by suitably displacing the brackets 35 and 4|along-their respective cross bars the position of the fold guide is alsolaterally adjustable relatively to the fold rolls.

Referring more particularly to Figs. 1f'and'4, the. continuous guideway33 is shown to comprise upper and lower T-section slots spaced apart andjoined at their extremities by senil-circular slots of similarcross-section having .their radial centres upon the axes of the sprocketwheel 31 and pin 33a respectively. Each guide blade 3| is provided withtwo pairs of rollers 34 which are arranged so that, with the'bladesclosely abutting, the rollers 34 are equally spaced apart in the mannerof the rollers of a' sprocket chain. The lteeth of the sprocket wheel 31enter between the rollers of the blades which enter the left hand curvedextremity ofthe guideway 33 so Vthat in the rotation of the wheel 31each roller engaged by the teeth receives a driving thrust to urge theblades along the guideway as a collective body. Asshown in Figs. 1, 3,4,A and 5, the guide blades 3`| when moving along the lower stretch' ofthe path on guideway n33 project downwardly beyond the lower edges ofthe plates 32 in such manner that the lower edges of the projectingblades form a continuous edge' which 'is inclined to the longitudinalaxes of the rollsl I9 and when approaching the right hand end of thelatter passes into the space immediately above the contacting rolls.Thesprocket shaft 36 is driven from a gear shaft 45 through the inter-AV"adjustable head stop is located to the right hand.

end of the rolls I9 (as viewed in Figs. 1 and 2) immediately above thesheet carrying stretches of the conveyor tapes 20. For this purpose, anangle bracket 53 (Figs. 2a, 6, and 7) is mounted upon a cross bar 54forming part of one transverse frame member I6 (Fig. 2). The anglebracket comprises a horizontal body 53a, a tail piece- 53h extendingdownwardly therefrom for clamping to the cross bar 54 and an upwardlyextending flange 53e which is drilled to form a guide for an adjustingscgew 53. As shownin Figs. 6 and '1 the bracket body 53a is providedwitha longitudinal egroove 56 in which slides a carrier 51 having anupwardly projecting I'ug 51a which is drilled and tapped to receive thethreaded portion of the lscrew 55.A Collars 55a pinned to the screw 55toeach side of the flange 53c'restrain the screw from longitudinalmovement so that in the rotation thereof the carrier 51 is displaced inthe groove 56. A shouldered set screw 38 passes through a slot 51hformed in the carrier 51 to engage the threads of a hole tapped in thebracket 53. When screwed downwards the screw 58 serves to clamp thecarrier 51 in the adjusted position. The outwardly projecting extremityof the carrier is bifurcated to form arms 59 winch embrace the righthand extremities of the plates 32 and serve to support rails 60 whichex- 'tend outwardly at right anglesgto the arms 59. Adjustable lay stopscomprising U-shaped members 6| are adapted to embrace the rails 60 andare adjustably clamped theretov by setscrews 62.

The work engaging faces of the lay stops 6I are fashioned so as to offera minimum of surface to I Contact with the work engaged thereby andaresuitably arranged by lateral adjustment valong the rails G0 to engagethe leading edges of the folded sheets at points adjacent the lateraledges of the latter.' Extremely ne adjustment of the Astopslongitudinally of the rolls I9 is effected by rotation ofthe screw 55.

In an alternative arrangement of the cross fold section C as shown inFig. 8, the conveyor tapes 20 are-slightly inclined to the longitudinalaxes .of the rolls I 9. The tapes are inclined in the 'oppositedirection to the inclination of the fold guides 3| and thus riseupwardly from the rolls I9 in approaching the stops or lays lil.l Bythis 'arrangement any possible overrun of the sheets relative to thetapes is damped so that the sheets are smoothly halted when in contactwith the lay stops. Furthermore by this arrangement of the tapes, theV-,foid of the depressedsheet, at its point of engagement in the bite ofthe rolls is somewhat deeper than in the rst described constructionwhich is an advantage in folding certain kinds of paper since the rollsI9 are presented with a maximum surface of paper with which initially toengage.

A travelling belt conveyor 63 positioned adiacent the cross fold sectionserves to discharge the work which is deposited thereon from the rollsI9, I9a. v'The discharge conveyor'63 extends f outwardly from themachine at right angles to the rolls of the cross fold section and tothis end ducing'a .S2-page book signature or pamphlet from a singlesheet of paper is as follows..

The sheet is laid upon the table A and progressed towards the bite ofthe leading pair of buckle fold rollers I0. The sheets may be fed to,and along the table A either by hand or, in the case of a fullyautomatic machine by a mechaniv cal sheet feeding device which isv notshown in the drawings. In passing through the buckle fold section B,three parallel folds are imparted to the sheet whichthen is fed by rollsI0, Ilia to the feed rolls "I8 and scoring discsi4. As the feed rolls I8progress the sheets to the conveyor tapes 20 the groove scored along thefolded sheet by the discs I4 is entered by the runner disc 30 while thelateral edges of the folded sheet engage the side guides 24. 'I'hesheet, pressed upon the conveyor tapes 20 by the runners- 5I,

are conveyed above the rolls I9 in a path parallel with the longitudinalaxes thereof while the guide blades 3i are moved downwards in a pathinclined to the rolls to meet and engage the sheet. Since theguideblades are travelling at a speed substantially the same as thespeed of the travel of the sheet, and the angle of inclination of themoving line of guide blades to the surface of the sheet is comparativelysmall the relative displacement of the sheet and contacting guide bladesis negligible so that the sheet is progressively pressed between therollers by the downwardly moving guid'e blades with a minimum 'offriction or distortion of the work. When the depressed point of the headofY the signature reaches the bite of the cross fold rolls I9`whichcoincides with the registration of the leading edge of the signaturewith the lay stops 6I. the rolls seize the depressed portion of the workand cross fold the entire signature in drawing it through the' crossfolded signaturesawith their edges fat an angle .to the axes of therolls is immaterial, ybut if it is desired to discharge the signatureswith the line of thecross fold at right angles to the direction of theirsubsequent travel as" would be vdesirable if further folding of thesignatures is to be effected, the rolls preferably would be formedfrusto-conical in shape as shown in Figs. 9 and l0, so that while theleading edge or head of the signature would be oblique to the axes ofthe rolls when 4engaged thereby the completely1 folded signature wouldbedelivered therefrom with its leading edge positioned at the desiredangle. As shown in Figs. 9 and 10, the. third roll I9a of the normalcross fold set is replaced by a deecting plate 65 whereby the crossfolded sheet as it emerges from the bite of the frusto-conical fold rollI9 is guided onto the discharge conveyor 63 or directed into a furtherfold set (not shown).

The signatures folded in this manner can either be stacked by thevdischarge conveyor as shown in Fig. 3 or may be fed to another foldsection (not shown) which may for example operate. in a manner similarto that of the cross fold sec, tion above described. A,

To those skilled in the art it will be obviousv that the invention asherein defined constitutes a folding unit not only useful as amachinebyY itself, but also useful as an attachment applicable to anykind of sheet folding machine without material deviation, while theparticular construction herein described may'be readily modiiied withoutdeparting from the spirit of the invention as hereinafter set forth.

We claim:- i. In a machine for folding sheets, afold unit 5 comprisingco-operating fold rolls, work conveying means arranged to present asheet to said trolls, a, travelling guide member arranged to move alonga path inclined to the longitudinal axes of y said rolls and leading tothe bite thereof, and. '10 means for moving said guide member. alongsaid path to engage the presented sheet and deect it into the bite ofsaid rolls. l

In a machine for folding sheets, a fold unit comprising'co-operatingfold rolls, work conveying means arranged to present a sheet to saidrolls, a travelling guide member arranged to move along a path inclinedto the longitudinal axes ofsaid rolls and lying in a plane which passesthrough the bite thereof, and means for-moving said guide member alongsaid path to engage the presented sheet and deflect it into the bite ofsaid rolls.

` 3. In a machine for folding sheets, a` fold unit comprisingco-operating fold rolls, work conveying reans for progressing a. sheetlongitudinally of said rolls, a travelling guide member arranged to movealong a path inclined to the longitudinal axes of said rolls and leadingt the bite thereof, and means for movingsaid guide along said path toengage the sheet progressively along its intended fold line and deflectit into the bite of said rolls. 'f

4. In a machine for folding sheets, a fold unit A comprisingco-operating foldV rolls, la travelling guide member arranged to movealong a path inclined to the longitudinal axes of said rolls and leadingto the bite thereof, conveying means for' moving a sheet between saidrolls and said guide member. and means for moving said guide mem- 40bei' along said path progressively to engage the sheet and press it intothe bite of said rolls. 5. In a machine for folding sheets, a fold unitcomprising co-operating fold rolls, a travelling guidemember arranged tomove along a path inclined to the longitudinal axes of said rolls andlying in a plane which passes through the bite thereof, work conveyingmeans for moving a sheet between said rolls and said guide member andmeins forpmoving said guide to engage said sheetl and deflect it intothe bite of said rolls.l y

6. In 'a machine for folding sheets, a fold u nit comprisingco-op'erating fold rolls, work conveying means arranged to present-asheet to said rolls' at a predetermined rate of travel, atravelling-'guide member arranged to move along a path vinclined to thelongitudinal axes of s aid` rolls and leading to the bite thereof, andmeans for moving saidfguide at a speed substantially equal to' the rateof travel of the presented sheet so as progressively to engage thelatter and del ect it into the bite of said rolls.

. 7. In a machine for folding sheets, a fold unit comprisingco-operating fold` rolls, work convey-v ing means arranged to present asheet-to said rolls at a predetermined rate of travel. a plu-r rality oftravelling guide members arranged to move in a continuous train alongapath inclined to the longitudinal axes ofsaid rolls and leading 'to thebite thereof, "and means for movingy said 70 guide members at a speedsubstantially equal to the rate of travel oi the presented sheet so thata n ber of said members ccessively engage the/sheet and deflect it intothe bite of said rolls.

' 8. In a. machine for folding sheets, a fold unit -75 'comprisingc'o--operatingfold rolls, work conveying means arranged to present asheet to said rolls, a plurality of travelling guide members arranged tomove in a continuous train along a path inclined to the longitudinalaxes of said rolls and lying in a plane which passes through the bitethereof, and means for moving said guide members so that a number ofthese members successively engage the sheet and deflect it into the biteoi said rolls.

9. In a machine for folding sheets, a fold unit comprising co-operatingfold rolls, work conveying means arranged to present a sheet to saidrolls, a plurality of travelling guide members, a guideway for saidguide members having a part thereof inclined to the longitudinal axes ofsaid rolls and leading tothe bite. of the latter, and means fory movingsaid guide members in a continuous train along said guideway so that anumber of said guide members successively engage the presented sheet anddeflect it into the bite of said rolls. y l

l0. In a machine for folding sheets, a fold unit comprising co-operatingfold rolls, work conveying means to progress a sheet longitudinally ofsaid rolls, a plurality of travelling guide members, a guideway havingsome part thereof inclined to the longitudinal axes of said rolls andlying in a plane which passes through the bite of said rolls, and meansfor moving said guide members in' a continuous train along saidvguideway so that a number of said guide members-successively engage thesheet and deflect it into the bite of said 1'0 S.

A 11. In a machine for folding sheets, a fold unit comprisingco-operating fold rolls, a guideway having a part'thereof inclined'tothe longitudinal axes of said rolls and leading to the bite of thelatter, a train of guide members positioned along said guideway inabutting relation, and means for positively displacing each guide memberin turn to shunt said abutting guide members along said guideway in acontinuous path of movement so that a number of said guide memberssuccessively engage the presented sheet and .deflect it into the bite ofsaid rolls.

12. In a sheet-folding machine, a fold vunit as claimed in claim 10which includes at least one runway associated with the guideway, andbearing members mounted upon the guldemembers so as to travel along saidrunway.

13. In a machine for folding sheets, a fold unit comprising co-operatingfold rolls, work conveying means arranged to present a sheet to saidrolls, at least vone guide member arranged to move along a path inclinedto the longitudinal axes of said rolls and leading to the bite thereof,means for moving said guide member so as to engage the presented sheetand deect it into the bite of said rolls. and means for adjusting theposition of said guide member relatively to said rolls and the workpresented thereto.v

14. In a machine for folding sheets, a fold unit comprisingcio-operating fold rolls, work conveying means arranged to present asheet to said rolls, a' work stop associated with said rolls to registersaid work in favpredetermined position relative to said rolls, at leastone travelling guide member arranged to move along a path inclined 'tothe longitudinal axes of said rolls and leading ing means arranged toconvey a sheet longitudinally of .said rolls, an adjustable work stopassociated withsaid rolls to register the sheet in a predeterminedfolding position relative to said rolls, at least one travelling guidemember arranged to move along a path inclined to the longitudinal axesof said rolls and lying in a plane which passes through the bitethereof, and means for moving said guide member to-engage the registeredsheet and deilect it into the bite of said rolls.

16. In a sheet folding machine, a fold unit comprising co-operating foldrolls, continuous conveyor tapes arranged to travel longitudinally ofsaid rolls to present the work thereto, at least e one travelling guidemember arranged to move along apath inclined to the longitudinal axes ofsaid rolls and lying in' a plane which passes through the bite thereof,and means for moving said guide member along said path to engage thesheet carried. upon said tapes and deect it into the bite of said rolls.

1'7. In a sheet folding machine, a fold unit comprising co-operatingfold rolls, continuous conveyor tapes having sheet carrying stretchesextending parallel with said rolls, means for driving said tapes so thata sheet laid thereon is presented to said rolls, at least one travellingguide member arranged to move along a path inclined to the longitudinalstretches said tapes and lying in a plane which passes through the biteof said rolls, and means for moving said guide member along said path toengage the sheet carried upon said tapes and deect it into the bite ofsaid rollers.

lso that asheet placed thereon is carried to said rolls,v at least onetravellingzguide member ar ranged to move along a path inclined both tosaid tapes and to the longitudinal axes of said rolls and lying in aplane which passes through the bite of the latter, andA means for movingsaid guide member along said path to engage the sheet carried upon saidtapes and deflect it into the ,bite 'of said rolls.

- rality of guide members arranged'to move in at continuous path part ofwhich is inclined to the, longitudinal axes of said rollsand lies` in aplane which passes through the bite thereof, continuous conveyor tapesarranged to travel between said rolls and said guide members to presentthe sheet to said rolls, said tapes being inclined to said rolls, andmeans for moving said -guide members to engage the sheet carried uponsaid tapes and deflect it-into the bite of said rolls. y i

r24). In awmachinefor folding sheets, 'a fold unitcOmprisingco-ioperating fold rolls, work. conveying means arranged to presentasheet to said rolls, a scoringY device arrangedVv tooscorei said sheetalong the line of the intended fold, a f travelling guidemember arrangedto move along a path inclined to the longitudinal axes of said rolls andlying in a .plane which passes through the bite'of said rolls,andmeans-*for moving said, guide member alongv saidpath toengage thepresented .sheet and deflect the lscored portion thereofl into the biteof said rolls.-

2l. In a sheet folding machine, a foldunit as said rolls. f

y forth.

claimed in claim 20, including at least one runner disc arranged toenter the groove scored in said sheet as the latter is moved towards thefold rolls. l

22. In a machine for folding sheets, a fold unit comprising co-operatingfold rolls, work conveying means arranged to present a sheet to saidrolls, a structure extending longitudinally of said rolls and having acontinuous runway channel and continuous guideway channel formedtherein, means for supporting said structureso that some part of saidguideway channel lies at an inclination to the longitudinal axes of saidrolls and in a plane which passes through the bite of said rolls, atrain of guide members arranged in abutting relation in said guidewaychannel, bearing members secured to said guide members and arranged torun along said runway channel, driving means for moving said guidemembers along said guideway so that a number of said guide membersengage the presented sheet -and deflect it into -the bite of said rolls,and means for adjusting said structure supporting means so that theposition of said strucveying means may be varied as desired.

23. A machine for folding sheets which in' cludes a parallel foldsection provided with means for imparting at least one fold to a sheetfed thereto, across fold section arranged to receive vand cross-fold thefolded sheets delivered from parallel fold section to said cross foldroll section, and means for moving said guide member along-saidpath toengage the parallel folded sheet during the feed thereof to said crossfold rolls, so as to deect said sheetinto the biteof 24. In asheetfolding machine, a fold unit as 'claimed in claim 1 in which thecca-operating fold rolls are frustro-'conical for the purpose set 25. Amachine for folding sheets which includes a parallel fold sectionprovided with means for imparting at least one fold to a sheet fedthereto, a cross fold section arranged to receive and cross fold thefolded sheets delivered from said parallel section, said cross foldsection comprising co-operating -fold rolls, a plurality of travellingguide members arranged to move along a-contin'uous path part of which-isinclined to the longitudinal axes of said rolls and lies in a planepassing through the bite thereof, continuous conveyor tapes arrangedbetween said parallel fold and cross' fold sections to convey tapes tocontrol the sheet laid upon the latter.

means" for driving said tapes, meansz'for'moving Y said guide membersalong said path to engage the parallel folded sheet during the feedthereof to said cross fold rolls, -so as to deect said sheet into thebite of said rolls, and means for adjusting the operative position ofsaid guide members relative to said cross fold rolls and said conveyortapes. Y

OstlARV Kimm.

